Homework Help:
Physics Relativity/Power Question?

1. The problem statement, all variables and given/known data
When a fusion power reactor is possibly created, it is expected to produce about 3 x 10^3 MW of termal power. If a fusion reaction produces 2.808 x 10^-12 Joules, how many fusion reactions must occur per second to generate this power???

3. The attempt at a solution
What i did was 3 x 10^9 J/s / 2.808 x 10^-12 J. But my problem is that if i do that i will only get seconds and not reaction per seconds. Please help.

1. The problem statement, all variables and given/known data
When a fusion power reactor is possibly created, it is expected to produce about 3 x 10^3 MW of termal power. If a fusion reaction produces 2.808 x 10^-12 Joules, how many fusion reactions must occur per second to generate this power???

3. The attempt at a solution
What i did was 3 x 10^9 J/s / 2.808 x 10^-12 J. But my problem is that if i do that i will only get seconds and not reaction per seconds. Please help.

The key to the question is in red above. So presumably the answer will have units s-1.

When you do your calculations, looking an the units, it is (Js-1) divide (J) which gives s-1, which seems like a good start.

By the way, the "reactions" in "reactions per second" is a count, so has no dimensions.